One can see from this fold-out the care that went into designing vents and ducts to ensure the circulation of air within doors, and the small slatted ventilation towers (not unlike beehives!) which were a feature of the architecture of the Herbert Hospital in its heyday.

The idea was to have permanent features as structural elements of the building which would ensure, without pumps or the use of artificial heat, that gentle drafts would ventilate wards, and especially (as shown here) the sanitary facilities of the hospital. The building has recently been converted into apartments.